Our first one is still working great after 3 years!
Just made another one and drilled a tiny pin hole
In the top of each lid to equalize air pressure in both buckets. Also attached 3″ clear drip tube to accelerate the dripping process. It works!

we are using Aqua Clear filter cartridge A40A-1A for our waste water RO plant in Pakistan , KARACHI, and want to recycle / reuse these cartridges. if any one knows about disposal process please inform me.

It would be even better if the manufacturers made the cartridges so that they could be opened and the contents disposed of, and then we could buy replacement infill and then the plastic wouldn’t need to be disposed of quite so frequently if at all. How about it manufacturers?!!